Contoso, Ltd., has a headquarters in London and has 20 branch sites. Each branch site connects to the headquarters by using a Virtual Private Network (VPN) over the Internet. The company plans to implement Skype for Business Server 2015. Before they start deploying the solution, they want to ensure that the network is capable of the required media traffic that the new solution will produce. The following image shows the results of the network traffic simulation.

You complete the network traffic simulation.
You need to improve media quality on the network.
Which three actions should you perform? Each correct answer presents part of the solution.